Beyond the energy balance: Exergy analysis of an industrial roller kiln firing porcelain tiles
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Other documents of the author: Ferrer Castán, Salvador; Mezquita, Ana; Aguilella, Vicente; Monfort, Eliseo
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Show full item recordcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/176601
comunitat-uji-handle3:10234/176618
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Title
Beyond the energy balance: Exergy analysis of an industrial roller kiln firing porcelain tilesDate
2019-03Publisher
ElsevierISSN
1359-4311; 1873-5606Bibliographic citation
FERRER, S., et al. Beyond the energy balance: Exergy analysis of an industrial roller kiln firing porcelain tiles. Applied Thermal Engineering, 2019, vol. 150, p. 1002-1015Type
info:eu-repo/semantics/articlePublisher version
https://www.sciencedirect.com/science/article/pii/S1359431118354371Version
info:eu-repo/semantics/submittedVersionSubject
Abstract
The ceramic tile manufacturing process consumes large amounts of energy, mainly in the firing stage. Firing usually takes place in natural gas-fuelled continuous roller kilns, the most widely used tile firing facilities ... [+]
The ceramic tile manufacturing process consumes large amounts of energy, mainly in the firing stage. Firing usually takes place in natural gas-fuelled continuous roller kilns, the most widely used tile firing facilities worldwide, which typically exhibit low energy efficiency (generally 5 to 20%). This paper investigates the application of energy and exergy balances to an industrial roller kiln firing porcelain tiles in order to identify the most critical parameters affecting kiln energy efficiency and propose ways of improving kiln energy performance. The experimental kiln measurements and thermodynamic calculations confirmed the kiln’s low energy performance (15%). Exergy analysis showed that 83% of the total exergy input into the kiln was destroyed, only 10% of the exergy input being kept in the physico-chemical transformations of the ceramic tile composition. The main sources of irreversibilities: natural gas combustion, heat transfer in the fired tile cooling process, and heat transfer through the kiln surfaces, were identified and quantified. The study shows that waste heat (over 61%) recovery could be expected to significantly increase kiln energy performance. Finally, further measures are proposed for optimising kiln energy efficiency. [-]
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Applied Thermal Engineering, 2019, vol. 150Investigation project
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